Olafus via Amazon has Dimmable Wireless Spotlight for Paintings Picture Display Closet for $14.39 when you clip 40% off coupon on the page. Shipping is Free w/ Amazon Prime or Orders $25+.
2 Pack dual head Warm White – $14.39
4 Pack single head Daylight White – $17.99
4 Pack single head Warm White – $19.79