Of all the items I considered for this current edition of Top eBay Chess Items by Price, the only one that looked suitable for a Mother's Day gift is pictured below. Titled 'Wee Forest Folk - Complete chess set', it sold for US $3499.99, receiving one bid the fourth time it was listed.
The description said only,
WFF Wee Forest Folk - complete chess set - amethyst and green sets. Never displayed. Out of boxes only for pictures. Pieces will be shipped INSIDE of the chess board box inside their slots. Total of 32 mice. Mint condition.
For more on WFF, see Wee Forest Folk. And 'Happy Mother's Day!' to all you Moms out there.