where can I get like nice packaging for physical products?

Sorry I wasn't sure which section to post this in.

Say I'm selling a physical product (as opposed to an ebook). Where can I get a nice, high quality customized package to put it in to mail it to help increase the customer's perception of a high quality item? Like custom printed boxes or folders or envelopes or that kind of thing.

I'm thinking maybe spending a few bucks on packaging could allow me to increase my price by 4-5 times that much.

Right now I just mail it in a US Mail priority mail folder. And then they open it and my product is inside. I want something better so when they take it out of the priority mail folder, instead of seeing the product, they see some classy packaging.

Hope i'm explaining well.

I honestly dont think it would be worth it. Too much hassle, I would stick with ebook.

I've been selling this physical book for 8 years online (since back before eBay started to suck... I used to sell a lot on eBay).

I'm keeping it a physical book because it's better that way. I just want to spice it up a bit.

is good for distribution, but for printing, any print-on-demand publisher could make you a nice looking book.

check Lulu & iUniverse.. Kunaki is good for products that can be shipped on CD/DVD, I've used them before; very pleased with the quality.