I don't know if I would order directly from SigArms 'cause they seem kind of expensive, but they just sent this in their weekly e-newsletter. All of the ones that they have listed are $52 each.
-CT
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Availability of SIG SAUER® 12- and 15-Round Magazines
New factory SIG SAUER® magazines with 12- and 15-round capacity are now available for sale on the SigStore or call your local dealer for pricing and availability. These magazines are marked "Law Enforcement Only" but are now legal for sale to the commercial market with the sunsetting of the 1994 Assault Weapons Ban. SIG SAUER pistols that can carry 12- or 15-round magazines are the P226, P228, P229 and the SP2009 and SP2340. Sales of these magazines to California, Hawaii, Massachusetts and New York are prohibited. Online orders for magazines from customers in these states will be cancelled.
Magazines available for sale through the SigStore for these pistols are:
12-Round magazine for the P229 chambered in 40 S&W or 357 SIG
Part # 34224624P
13-Round magazine for the P228 or P229 chambered in 9mm
Part # 34280482
12-Round magazine for the P226 chambered in 40 S&W or 357 SIG
Part # 34260608
15-Round magazine for the P226 chambered in 9mm
Part # 34260603P
12-Round magazine for the SP2340 chambered in 40 S&W or 357 SIG
Part # 34290500P
15-Round magazine for the SP2009 chambered in 9mm
Part # 34290510P
These magazines are brand new. Depending on the volume of online orders please allow 6-10 weeks for shipping.
Regarding New SIG SAUER Pistols with 10-Round Magazines
Dealers and distributors currently have P226, P228, P229 and SP2009 and SP2340 pistols in inventory that were shipped with 10-Round magazines. SIGARMS has supplied distributors with a coupon to include in these gun boxes. The coupon applies to new and Certified Pre-Owned SIG SAUER P226, P228, P229 and SP2009 and SP2340 pistols purchased between September 14 and December 31 of 2004. The coupon allows the purchaser for the pistol to buy 1 hi-capacity magazine for $14.99 or 2 hi-capacity magazines for $19.99 and either order comes with a free SIGARMS® hat valued at $16.95. This price includes shipping. The coupon can be downloaded from the SIGARMS Website. To redeem this coupon simply complete the form and return it to SIGARMS (as instructed) with a copy of your 4473 and proof of purchase (sales receipt). The maximum number of magazines that can be ordered through this special offer is 2 per pistol. This coupon offer is void in California, Hawaii, Massachusetts and New York and other locals where prohibited. Please allow up to 8-12 weeks for delivery.