I usually see quick arms/pins for around $3-$400 new.
Then you have the job of getting it married up to your current loader. If you have the cutting and welding tools and skills, probably $30 worth of materials. Welding shop would be close to $200. At least you have your current bucket for a pattern, or even using a portion of it and just weld in the SSQA.
Decent forks around here are $750, buckets can be had cheaper if you can snag a used one.

Then you have the job of getting it married up to your current loader. If you have the cutting and welding tools and skills, probably $30 worth of materials. Welding shop would be close to $200. At least you have your current bucket for a pattern, or even using a portion of it and just weld in the SSQA.
Decent forks around here are $750, buckets can be had cheaper if you can snag a used one.