Bubble mailers are about $10-20 cheaper on ebay than valuemailers. Although we I need to purchase lots of different items I buy from valumailers for the convenience.
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Either valuemailers and I also found that HMHM amazon had actually the lowest price for what I was looking for. Nice a stealth buying from amazon to sell LOL
Do not know if this helps u or not, but USPS has bubble wrap mailers (Priority Flat Envelopes). Much better then their other Priority envelopes. I order 100 at a time. They are slightly more expensive --- 4.95 as opposed to 4.75 --- to mail. These are nice bubble wrap mailers, and as always ---delivered to your door free of charge.
I use https://boxgiver.com/. They have free shipping boxes, bubble wrap, and packing paper. I know people post on there a lot and give their packing supplies away. Hope that helps!