For the OP (original poster): you're in the States (Kansas City). Call Carlos at MRR Wheels (Los Angeles, CA) if ever interested in after market rims. They've got a great selection, ship anywhere for a reasonable price (they shipped to me in Canada) and have really good after sales care. They sell true forged rims and other types and will accurately describe what you buy. Or at the very least, use them to price compare with someone reputable that's closer to you.
Having said that (perhaps the above will help others in the States) I realize you're simply looking to verify what your dealer told you on prices, in order to better upsell you on the tire/rim warranty. I agree 110% with everyone else: you're being misinformed and for that alone, consider talking to someone else about this type of warranty...
Finally, as with any warranty, READ THE FINE PRINT to understand what you'd get and try to find reviews on people's experience with this particular warranty company. Tire/rim warranties usually only kick-in to replace a rim or tire if they're totally ruined (can't be repaired and are incapable of retaining air). So consider the roads you frequent and how bad the potholes are, or the odds of puncturing the sidewall of a tire, when deciding if the asking price is worth it. It may be unlikely you'll ever make use of this kind of warranty. That's not to say it doesn't happen, but you may be paying +++ for a warranty you never use...