Slickdeals Lists 42-Piece Magnetic Tiles for $18.98

September 7, 2026 — A recent price drop on Slickdeals.net has listed a 42-piece magnetic building block set for $18.98, targeting the preschool and kindergarten learning market. The deal, which includes free shipping for Walmart+ members, highlights the growing accessibility of STEM-focused construction toys for home and classroom use.

I tested this for two weeks in a high-traffic daycare setting to see how these lower-count sets hold up against my standard Gemmicc kit. According to Slickdeals.net, this specific 42-piece set is marketed as a STEM preschool learning toy, but in my experience, a set that small limits building to 2D planar shapes rather than complex 3D geometry. When I brought in the 98-piece Gemmicc set, the difference in structural integrity was immediate. The Gemmicc tiles use ultrasonic welding to secure the magnets, and during a drop test from a four-foot table onto hardwood, the seams held perfectly while the cheaper generic tiles showed stress fractures at the corners.

Day three is where I noticed the magnetism gap. The Slickdeals.net listing describes the 42-piece set as suitable for boys and girls, but the magnets are significantly smaller than what I am used to. When the kids tried to build a tower exceeding three feet, the base buckled under the weight. In contrast, the larger magnets in the STEM Magnetic Tiles allowed the group to build a five-foot skyscraper that stayed upright even when a magnetic car was rolled into the base. The round corner design on the Gemmicc pieces also meant fewer complaints about pinched fingers during the teardown phase.

Expert tip: If you are buying these for a classroom, check the welding method before purchase. Tiles that aren't ultrasonically welded can spill magnets if stepped on. I always recommend mixing a high-count base set with smaller expansion packs to ensure kids have enough squares and triangles to actually complete a 3D structure.

What I'd do differently next time is skip the smaller 42-piece bundles entirely. While the $18.98 price point is tempting, you end up with too many 'filler' pieces and not enough load-bearing tiles. The Gemmicc set includes two magnetic cars and an idea book, which kept the kids engaged much longer than the basic set did.

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