Ripped this off from spystyle on surplusrifleforum.com:
Cheaper than dirt and Sportsman's guide are about the same
Wolf® 8 mm Mauser® 196 Gr. SP 20 rds.
$14.77 = $0.73.8 per shot plus shipping
WX2-97335 Federal® Power - Shok® 8 mm Mauser 170 Gr. SP 20 rds.
$28.47 = $1.42 per shot plus shipping
WX2-12170 Winchester® Super - X® Military 8 mm Mauser (8 x 57) 170 Gr. PP 20 rds.
$23.17 = $1.15 per shot plus shipping
http://www.aimsurplus.com
A8mmY75 Yugoslavian 8mm (7.9x57) M75 Sniper Grade
15rd box: $5.95 = $0.39.6 per shot plus shipping (+discounts in multitude)
http://www.ammoman.com
A8mmY75 Yugoslavian 8mm (7.9x57) M75 Sniper Grade
$79- 150 Rounds. (shipped) = $0.52.6 per shot shipped
Wolf 8mm MAUSER SOFT POINT
$140- 200 rounds (shipped) $0.70 per shot shipped
http://www.militarygunsupply.com
A8mmY75 Yugoslavian 8mm (7.9x57) M75 Sniper Grade
$329.95 - 900rd = $0.36.6 per shot plus shipping
http://www.samcoglobal.com
8mm MAUSER BALL (7.92x57JS) Mfg. FNM Portugal. FMJ, 198 GR. Boatail NC/BE
400 rds $ 119.60 = $0.29.9 per shot plus shipping
800 rds with wooden case $ 239.20 = $0.29.9 per shot plus shipping
http://www.jgsales.com
$21.00 - 8mm Mauser Turkish FMJ, 70rds on clips in bandoleer.
= $0.30 per shot plus shipping
$174.95 8mm Mauser Romanian 154gr FMJ, in 500 round cases.
= $0.34.9 per shot plus shipping
http://www.wideners.com
A8mmY75 Yugoslavian 8mm (7.9x57) M75 Sniper Grade
$5.95 per box of 15 = $0.39.6 per shot plus shipping
$315.00 / 900 CASE = $0.35 per shot plus shipping