You looking for G19 15 rd? Botatch Tactical is my first check for mags - generally $22 ea + free shipping. Looks like they are in stock (usually are ) http://www.******tactical.com/gl199mm15ma.html
Yeah - something about that sight and this forum but you get the idea - right?
If you are okay with used (LEO turn ins)
check with Mark at Summit Gun Brokers. G22 are usually $12 with others at $15. Stock varies but the business is lively!