IMI Desert Eagle .40S&W magazines

[Bilknaar]

I recently bought an IMI Desert Eagle, chambered in .40S&W. The pistol came with 2 10rd mags, internet research has given me very little help. Some say CZ75B mags will fit, but they seem a hair too short for my pistol. I know there are some Mec Gar mags and a few others out there, but they seem really scarce and or expensive. Attached is a pic of the handgun for reference. Thanks!