Note:Serious Buyer's Contact Only by... aabulai@yahoo.com Garmin Tracking Collars & Systems for Dogs. The New TT15 collar is compatible for Astro 320 and Alpha 100 GPS. We sell extra dog collars for the DC40,DC50,TT5,TT10 and TT15 if needed. Here is our Best wholesale prices GARMIN ASTRO 320 GPS + 6 DC 50 COLLAR DOG TRACKING COLLARS---$450usd GARMIN ASTRO 320 GPS + 5 DC 50 COLLAR DOG TRACKING COLLARS----$350 usd GARMIN ASTRO 320 GPS + 4 DC 50 COLLAR DOG TRACKING COLLARS----$300 usd GARMIN ASTRO 320 GPS + 3 DC 50 COLLAR DOG TRACKING COLLARS---$250 usd GARMIN ASTRO 320 GPS + 2 DC 50 COLLAR DOG TRACKING COLLARS---$200 usd GARMIN ASTRO 320 GPS + 1 DC 50 COLLAR DOG TRACKING COLLARS---$150 usd GARMIN ASTRO 320--DC 40 ---------- GARMIN ASTRO 320 GPS + 1 DC 40 COLLAR DOG TRACKING COLLARS----$100 usd GARMIN ASTRO 320 GPS + 2 DC 40 COLLAR DOG TRACKING COLLARS----$150 usd GARMIN ASTRO 320 GPS + 3 DC 40 COLLAR DOG TRACKING COLLARS----$210 usd GARMIN ASTRO 320 GPS + 4 DC 40 COLLAR DOG TRACKING COLLARS----$270 usd GARMIN ASTRO 320 GPS + 5 DC 40 COLLAR DOG TRACKING COLLARS----$300 usd GARMIN ASTRO 320 GPS + 6 DC 40 COLLAR DOG TRACKING COLLARS----$400 usd BRAND NEW Garmin Alpha 100 GPS Training & Tracking Collar (4-Dog Combo)===$500 usd BRAND NEW Garmin Alpha 100 GPS Training & Tracking Collar (3-Dog Combo)===$570 usd BRAND NEW Garmin Alpha 100 GPS Training & Tracking Collar (2-Dog Combo)===$500 usd BRAND NEW Garmin Alpha 100 GPS Training & Tracking Collar (1-Dog Combo)===$300 usd