Just for giggles suppose i get a Scratched up 686 for 550$ (cheapest ive seen locally) and get cylinder and slide to do the following
SR004 - Action Job on K - L - N Frame (includes spring kit) $126.95
SR034 - Remove Hammer Spur $55.05
SR100 - Convert to Double Action Only $49.37
SR036 - Install Fixed Trigger Stop (hole not drilled completely through trigger) $54.20
SR024 - Radius and Bevel All External Corners - Edges and Front of Cylinder $94.21
SR012 - Bead Blast Refinish Stainless Revolver $83.43
Total $463.21
comes in close to the 1000$ budget (id keep 2-300$ for any problems they find and contigencies)