Just a quick add here... Tesco are currently selling tan envelopes at £1 a packet, in the packet is a large/medium/littler medium
and 2 small envelopes, each with bubble wrap inside.
You can also buy the larger envelopes (also bubble wrapped inside) for 19p each. In my case I went for the 19p large ones. Bought 40 single Large ones and am sorted as far as selling games goes for a while, I normally sell single games but I have alot of old xbox/ps2 etc games I want to clear space with. I have a new load of 360 and PS3 games in and i need the space lol. Those envelopes fit anything between 4 and 8 games in if placed in properly, that keeps the costs down for me. They also come with a tear away strip to stick them down properly, saves on tape etc