I started putting together the '70-'71 OPC Deckle Edge set, and I've been enjoying the chase. I'm picking up the commons for between $2 and $5 which makes for some affordable fun.
I've also been trying for some of the '69-'70 OPC Mini Card Albums, but I keep getting outbid. I did purchase this low grade example for $7.92 with a slightly trimmed Bobby Orr.