One from each manufacturer. Expect the majority of samples you get will be garbage. Just consider it a cost of doing business

I once got a sample from a supplier and they only charged me $15 and got the sample in about a week. However When I asked to get some changes made and a new sample they told me it would be $80. I agreed and sent them the money, over a month later I didn’t hear from them so I emailed them and hey hadn’t even started it yet.

Alibaba suppliers always offer insanely overpriced samples from my experience. I was trying to get a sample aquarium, which they were looking to sell for $30-$40 per a unit after price negotiations, but they wanted $2000 for a sample.