There's a whole whack of online vendors. Some that come to mind this early in the morning are Tweetys, PPLmotorhomes, RVdirect, Dyersonline.
Rule no. 1, unless you have money to burn or need something immediately, is don't buy from a dealer. Be very wary about warranties on things when buying online, especially Ebay and Amazon. Sometimes you only get a 90 return when the original manufacturer had a 1 year (or longer) warranty.
Camping World has a lot of eye candy to look at on their website but even when things are on sale, you can usually find a better price online. It's a good place to see what's available out there, but they don't carry all brands of things. If you stay on top of their ongoing special online sales, occasionally you can snag a good deal on something. And they don't carry all the same stuff in their stores compared to online.
You need to watch the "free shipping" thing when shopping online. There really is no such thing a free shipping. It's either buried in the price or it's an add on. Sometimes vendors include it in their price and sometimes not. Sometimes a vendor does not advertise free shipping on their home page and you don't find out until checkout. Sometimes you have to go through a bunch of hoops to get to the final checkout page and you'll find they've added a handling fee or there's no free shipping because you need to spend $100 or $500 to get it.
We have been burned on Amazon so don't shop there much anymore unless it is cheaper than elsewhere, not likely to get damaged in transit. If something is defective or it arrived damaged, you end up eating part of the return shipping cost and you only get a partial refund.
Ebay can have really good prices, but so can direct vendors. Returns on Ebay are easy and Paypal will back you up as a buyer. If price is your criteria, shop 'til you drop on the internet.
I just bought some Oscar rivets from RVdirect that come in a box of 10. One was defective. I emailed them and 2 days later, another complete package of 10 arrived!! Now that is customer service and you'll never get that on Amazon.
I was at a local dealer a few days ago and got a nearly 1" thick book of tons of RV parts from all kinds of vendors. Was $6 but got it for free. No prices but lots of manufacturer's names and part numbers. Great data for doing online searches. Found some things I hadn't come across before. Perhaps you can find a dealer that has a similar book?
Please excuse my wordiness.....
Gil & Deb & Dougal the Springer Spaniel
2014 KZ Spree 262RKS & Ford F250 supercab V10 4x4 LB