Cheap, yes, not very knowledgeable either. Not dissing you
You can likely find a decent sporter take off barrel at a gunshow in the $50 range. By the way, you can use any 30 calibre take off barrel. Not enough difference to cause any issues.
Then it will cost around $150 to have your old barrel removed, unless it's pressed and pinned, cut back the chamber and make up a thread tenon, have it reamed to proper dimensions and installed.properly, add the sight etc.
Cheaper to purchase another rifle.
If you read my OP, the barrel is PINNED. It's easy to pull it of.And it's not any different then switching 303 LE to 7.62x39.