don't overlook the strip rulers...i have 2 that have grooves every half inch...i can do 8 layers of fabric at a time and can cut the width of the strip, turn ruler 90 deg and then cut all again at whatever size you choose, no dies to purchase for different sizes... one ruler 12 x 12 was $14 dollars years ago but i recently bought a 12 x 30 for $25 on sale... these are so handy for any size strip, and for easy bias strips that i would never spend the extra money...i don't do applique so i am not tempted by the specially shaped pieces, but you have to shop for your needs... i only mentioned these as you specifically asked about squares...