Layaway Days: Art collecting on a Budget
John Doe, best known in the Urban Art community for his 'Miss Universe' piece, has two sketches available in his online store. 'Slave' sketches #2 and #3 are available for 65 GBP. The pieces were created using spray paint and acrylic paints. As far as originals go, these are extremely reasonably priced works, from an established artist.
Sketches are available here