I hopped on the 250 this morning and took it for a quick spin down the road and up the power lines......man that damn thing is fun.  Wish I could have rode longer but one of my back wheels won't hold air but about 10mins-haha.  I got a set of z400 hubs, a nice set of used 400ex rims on the way and will be ordering tires today.  So it will be on next weekend.

I don't think I've ever owned a tire that didn't have slime in it at some point.
It works, it's cheap, it's easy to use.

Oh, there's an alternative to slime or patching a tire...pool noodles!
Cut them to the width of your tire, and stuff them inside until you can't fit any more of them in there, re-seat the bead, and go drive over some nails.
You can use regular pool noodles or you can buy
Once they're in there, you actually don't need air pressure, like a run-flat tire or something.
Works even better with beadlocks.
http://www.polarisriders.com/104-outlaw-how/32996-walmart-balls-another-poor-mans-tire-balls.html
http://www.quadzoneforums.com/forums/showthread.php?t=26823

The expensive version of pool noodles or Walmart balls are....tire balls.
http://www.tireballs.com/

There's an outfit locally that tailors to ag repairs, and they can fill tires with foam.
It takes 3 days to fill and cure a tractor tire with a hard foam that completely fills the tire and wheel groove.
End result is a tire that doesn't need any air pressure to handle its max rated weight, and is impervious to punctures regardless of size.
Best part of it is the foam hardly adds any weight to the tire and will last longer than the tire carcass.
Bad part is that you have to cut the tire off the wheel when you wear your tread off.
I've been filling my tail wheel tires like that for years, and since its a two piece wheel I don't have to cut the tire off to replace it.
Doesn't cost that much to do (costs me $40), especially when a new tube costs $65.
They even have different density foam for different tire profiles...so if you need your tire to squat they'll add low density foam.
High density goes up to a 60psi equivalent, low density goes down to 4psi, and they can mix it anywhere in between those figures (also depends on tire profile).
It doesn't work worth a damn after a long burnout though...the foam eventually melts and leaves an air gap around the inner surface of the tire.

Heat is the enemy of the mousse bibs (foam inserts) used in off road bike tires. Tire balls need generous lubing from friction.

Tire Johnnys is another foam type insert used in atv tires. There are others I can't think of at the moment

If the tire shop here charged extra for having slime in the tires then they wouldn't have any business.
You really don't want to get stranded out on a dirt road in the desert where towns are often separated by 50 miles or more, and most of the towns are too small to even have a tire shop.
It's pretty much a necessity in an area covered by plants that have some sort of thorns growing on them (mesquite, cactus, yuccas, cat claw, etc.).
Not only that, but you've got dead greasewood stumps, sharp rocks, and a million other things that'll flatten a tire as soon as you unload the quad from the trailer.
Even animals will flatten a tire, it's not uncommon for a tire shop to find a porcupine quill or a rattlesnake fang still embedded in the tire.
Shops around here require heavy gloves when working on tires...one guy lost his arm and another nearly died from running his hand across a fang while feeling for what caused the flat.
Last shop I went to had a pressure washer with a custom made nozzle that sprayed in a 360 arc, so they could spray the inside clean in a matter of seconds.
Besides, everyone who works at a tire shop has that same dirty look, you can tell who they are just by looking at the black crud all over them.
I've yet to see a tire mechanic who was remotely clean in appearance...and if you bring them a brand new tire with a clean wheel, it will wind up being dirtier than when you brought it to them.
I don't see how slime could possibly make them or their shop look any worse