We have had an Amazon.com Prime account since Amazon.com started offering it. When you need something quick it is the only way to go. There is no real "FREE TWO DAY SHIPPING" though, because they build the shipping charges into the price you pay.
As far as other RV items go, We use google shopping search to compare prices, ratings, etc. to choose who to buy an item from even though most are available on Amazon.com.
Recently I purchased Sumo Supersprings for the rear of our Sunseeker from Autoplicity.com and was very happy with the price, free shipping, and fast delivery.
When I went to purchase the Sumo Supersprings for the front, I was going to use Autoplicity.com again trouble is, the free shipping was no longer available and the price was higher than I was able to find elsewhere. I went with SDTrucksprings.com. In both cases the prices were $50 cheaper than etrailer.com.
The Sprinter 3 piece Cab Window Insulation Set is coming from Eurocampers.com. I chose them because of the product availability, the custom build to order, the available options, and the fact that the side windows covers use velcro to hold them in place instead of suction cups. They weren't the highest price for the same options either.
I ended up ordering the Carefree SunBlocker EZ Zipblocker from AdventureRV.net. The best overall price when using their economy shipping and their good overall customer rating of the company.
Since we only need internet to read emails, pay bills, or surf the web while in rural areas, I chose a Straight Talks 4G LTE mobile hotspot. Walmart.com price for the unit itself is $48.88 with free shipping. They offer several different pay as you go plans. I purchased a 1 gig 30 day plan for $15. If you don't stream video, U-tube, or upload tons of pictures, the 1 gig will work fine for you. They have a AT&T based device as well as a Verizon based device.
I chose AT&T because they cover rural areas far better than Verizon, which is the main reason for acquiring a WIFI hotspot in the first place. Our current cell plan is with T-mobile 5 gig monthly high speed data, then unlimited data afterwords, which is fine for emails, bills, and web surfing. T-Mobile coverage is excellent in major metropolitan areas as well as along major roadways. T-Mobile is also compatible with AT&T networks so we already have voice and text in rural areas.
I actually could have gone to the local Walmart and purchased this product but with free delivery, why drive. As an added unknown bonus, the Hot spot came with a free 30 day, 1 gig plan that wasn't advertised.
The biggest thing, I have learned through equipping an RV for the first time is not to be overly concerned about being loyal to one supplier, for if you are, you will be taken advantage of.
In the retail business, every storefront has what they call "lost cost leaders". They will take a loss or minute profit on a few items in order to get you in the store. Once they get you in the door, they figure they will make up that loss by over charging on other items.
Just recently, Murelene decided she wanted better and newer folding lawn chairs for our new RV. Since, I am now a house husband, and good at it BTW, I went shopping. I found that the secret to a happy marriage is "YES HONEY"
. I just had to interject that into this long rant.
But really what I found was that the price of the same lawn chair was $8 less prior to the 25% off sale price at Meijers than it was across the street at Target which was not running a sale.
The moral of the story, figure out the brand and model number, search the internet, then choose the best price, for the item will be the same regardless of how much you pay.
Hopes this is of some help, Sherman