low-cost Powerblocks alternatives??

[Fightguard]

I can't afford Powerblocks and I searched another post and someone mentioned they had these at Walmart,
http://www.designbig.com/webfolio/smartfitweights/products/dumbells.htm
However, I've been to 2 Walmarts and had a friend check another...couldn't find them. Anybody see these or have any other suggestions?
Thanks.

[bdckr]

I think you may have seen my post.

They definitely have them still at the 7 & 400 Wal-Mart.

$40 for each 25lb one.

[Fightguard]

thanks...I ended up finding them myself at my nearby walmart. they weren't in the weights section but were hidden under the all the home gym boxes.
anyway, $40 each for 20 lbs...that's the only size I saw so I didn't get them. I want the 30 lbs. at least.