What about these Tula ones?
http://www.rrcfirearms.com/pd-tula-ak-47-bakelite-magazine.cfm
Put it this way.....
What are the most expensive ones?
One, the link you provided is for a museum piece and not even available and Tula anything is not quality.
You want a good quality mag, you pay for it.
From the article I posted (prices).
Make Model Body Material Spring Material Follower $MSRP Rating
Thermold AR-15 30-Round polymer stainless steel standard $10.00 3.7
C Prdts. Def. 30-Round Stainless stainless steel stainless steel anti-tilt $16.00 4.1
D&H Tactical AR-15 30-Round aluminum stainless steel anti-tilt $16.00 4.3
Brownells 30-Rnd. w/CS Spring aluminum chrome silicone standard $15.00 4.3
TangoDown ARC Mag polymer stainless steel anti-tilt $18.50 4.4
TAPCO Intrafuse Gen II polymer stainless steel anti-tilt $14.00 4.4
Lancer Systems L5 Adv. Warfighter polymer / steel stainless steel anti-tilt $16.00 4.9
Magpul PMAG MagLevel polymer stainless steel anti-tilt $18.00 5.0