Where to get empty burlap coffee sacks?

Q : I'm looking for empty burlap coffee sacks for gardening and craft projects.
I've seen some on eBay and a lot of American sites, but I want something that's affordable and in the UK.

The question:
Does anyone know if coffee shops (like Caffe Nero, Costa Coffee, etc) will give or sell you their empty sacks? I'm looking at the larger chains, as I know a store in London sells them, but I live at the other end of the country, and that's not really practical.
A : I would try asking at a small independent coffee roaster. The chains will probably give you the sacks if they roast the beans on site. Most chains have one roasting facility and multiple retail locations. They get raw beans in the burlap bags so the used bags will be at the roaster.

Can I use the empty tea-sacks for coffee?

Q : For those who don't know, they are empty paper tea bags that you put loose leaf tea in for convenience. I am wondering if I could also put course ground coffee in the bag and brew it in my mug?

Would it affect the taste?
Have you done it before?
Why or why not?
A : i would do it, but then, i just let the grounds sink and sift them with my teeth at the end of the sludge... oh, er, coffee!

when i buy green coffee beans from a burlap sack on the open market can i end up getting decaf beans unknowing?

Q :
A : No.
The coffee beans need to be processed in a particular way to remove the caffeine.

What would happen if you ate a whole sack of coffee grounds? Would it make you high?

Q :
A : word