Depends on what you define as budget, and what kind of adjustments you need.
Synthetic Remington monte carlo stocks and forends are around $80 to $100.
Boyd's American Plainsman stocks and forends run $150-$200 depending on options.
Bill Davis Stocks basic stock is $210 plus shipping
Numrich has factory straight trap stocks and forends for $190.75, which probably the deal of the year at this point.
Shop for your Stock & Forend Set, Orig, New Cond. Set B, Trap Wood -Walnut Wood, Satin Finish. with Numrich Gun Parts - the world's largest supplier of gun parts.
www.gunpartscorp.com
Remington wood stocks are hit or miss on price, bought on at a local gun show for $35 a couple of years ago, seen them in the $50-$250 range in eBay.
If the Remington parts store ever comes back online, you may be able to order an Express trap stock and forend.