Surely that's a very easy question to answer...
My guess is it will depend on the merchant.

I'd be surprised if there's a substantial domestic scale plastic recycling
market.

Metals are relatively valuable, compact and easy to process.  In most cases
simpy metling them down and selling ingots is a profitable exercise.

Most plastics have very low raw material value and are hard to reprocess.  
Transport, storage and and recycling often cost more than the end product is
worth.  I expect most plastic recycling is either indirectly subsidised (e.g.
piggy-backed on council waste collections, or landfill charges), or large
scale industrial waste.

Paul