As the title states it's the best price iv found for the PSR version, mine arrives today! Link posted below and it arrives royal mail 24 tracked for £4.95 (no I'm not affiliated with them in any way)
https://www.cdsgltd.co.uk/mtm-predatorrest.html
BSA JB Superten carbine MK2 action in MK3 stock done in realtree hardwoods by hydrographics.
BSA Ultra CLX first edition SN181