'55-59 Repro Parts Pricing Question

[Dan in Pasadena]

Searching online for weather stripping I notice that ClassicParts.com sells a pair $24.99 but the same thing sells at BrothersTrucks for $39.99.

For vent window glass, Classic = $19.99, Brothers is $44.99 (yes, a single piece)

I assume if I go on checking there are similar huge differences on a lot of things each sells.

SO, you guys have bought a TON of these repro parts and I haven't,...yet: Which should I buy?

Yes, generally "You Get What You Pay For" but when I owned my '46 truck I spoke with a guy that sold parts for it on eBay and retail and he said a huge quantity of the parts came from the same original sources of supply. Why would this be any different for my '55?

Have you guys noticed a BIG difference in quality, accuracy and/or service from these two supply houses? Are there other repro parts houses you recommend. I know about LMC. Others?