For those that purchased the M4 slip on, where did you buy it and how much did you pay? I remember reading in the posts that a certain website offered a discount to forum members. Ive searched and searched but cant find the thread. It seems most sites have them listed at 379 now. I swear when I looked before they were around 350 and I thought with the discount it was around 325. Ide like to save that 50 bucks if possible. Anyone know the cheapest place to get it? Thanks.