The recent sell-off is likely an excellent buying opportunity for Shopify.In an environment where e-commerce companies have performed well recently, Shopify's (SHOP 1.29%) stock has struggled. Since surging above $91 per share in February, lowered sales guidance seems to have weighed on sentiment. Consequently, it sells at a 33% discount to its 52-week high.That leaves investors questioning whether they should take advantage of the discounted stock price or hold out for a deeper discount. Still, with its ma ...