Bassinet Sheets Compatible with 4moms Mamaroo Sleep Bassinet - Fits 18 x 30 Inch Oval Bassinet Mattress – Snuggly Soft 100% Jersey Cotton – 2 Pack – Light + Dark Grey – 2 Pack Light Grey + Dark Grey for 4Moms Mamaroo Sleep Bassinet is up for auction in Baby Products. The current bid is $2.50, 90% below the $25.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.