There are lots of places to buy RV parts for less than the asking price at the dealer's storefront. Try the big box stores, HD, Lowes, WalMart, Ebay, for starters. Also, do a Google search for what you're looking for.
You can buy LED lights for about 30% of what you quoted for Autozone prices. Google it, Ebay it, check out the clearance aisles every time you go into CW.
And, just so you know, RV's are like boats. They are inherently expensive, break often and usually when you least expect it.... Personality? Don't make it angry at you
The two happiest days in an RV'ers life: The day you buy the new one and the day you "FINALLY" get rid of it......