Walmart offers Educational Insights Jumbo AlphaMagnets- Multicolored Lowercase (Set of 42) for $7.88 (orig. $17.14) +$5.99 shipping or free ship to store.

Product Description:

The highest-quality magnetic manipulatives available! Features more and stronger magnets than other magnetic letter sets to ensure each piece stays where you want it and doesn't slip. The magnets feature easy-to-grip handles that are perfectly sized for little hands. Children can learn alphabet and number sequences, words, sentences, and math equations. The set comes in a durable plastic storage case.