Amazon has this Tulip One Step 18-Color Tie-Dye Kit for only $14.95 (Reg $29.99) and Prime Shipping. The kits includes enough tie-dye supplies for a party of 6 people and features 18 easy-squeeze bottles of highly-concentrated nontoxic One-Step dyes in popular colors.
If you are not already a Prime Member you can join with a 30-day free trial of Prime, as a student with Prime Student, or as part of Amazon Family.
Please note that Amazon prices are subject to change at any time and may have increased or decreased since this offer was posted.