I would guess anywhere that sells Traegers would carry pellets.
Below is a list pulled from Traeger's website as dealers within a 25 mi radius of Crandall, TX
LANDSCAPES INCORPORATED
1426 Mariposa
Mesquite, TX 75150
(972) 288-2675
ACADEMY SPORTS
3677 Emporium Circle (next to Circuit City)
Mesquite, TX 75150
(972) 682-3450
HAPPY TRAILS USA RV SUPERCENTER
2315 E. I-30
Rockwall, TX 75087
(972) 772-5607
LAKEVIEW POWER EQUIPMENT
3902 Lakeview Parkway
Rowlett, TX 75088
(972) 475-9946
BIG D BOLT & TOOL
3633 W Miller Rd
Garland, TX 75041
(800)344-2443
GRILLDADDY T
6605 Bluebonnet Dr
Rowlett, TX 75089
(469) 964-3362
WEST LAKE ACE HARDWARE
324 E Beltline
DeSoto, TX 75115
(972) 274-1133