The pudding is homemade, there is a sticky for it on this forum. I bought the goats milk at walmart. At my walmart it's on the bottom shelf of the baking goods aisle, by the evaporated and condensed milks.
Cheaper than a play pen is a plastic bin that slides under the bed (or any kind of box/bin that height/size...) plus, if that is where they are going to be whelping, it's easier to reach into to help out. We kept ours in that until last night, when we moved them into the x pen. That is working out nicely as now there is more room for momma to nurse those growing babes.
If you are going to keep them in a carpeted room for a while, I suggest buying some heavy vinyl to lay over the carpet. I got mine at our local walmart, in the fabric section. I want to say it was about $2 a yard, and I bought 2 or 3 yards to have under and around the whelping box. SAVED MY CARPET!