Short answer: For general lowest prices across many sellers, Shopee is widely regarded as the cheapest option in the Philippines. If you want fashion-only fast‑fashion with very low item prices, SHEIN is a top contender. (Zalora tends to be more brand‑focused and pricier.) (ginee.com)

Quick context and tips:

• Shopee’s marketplace model and seller policies usually produce the lowest listed prices and frequent vouchers/promos (it even has a “Lowest Price Guaranteed” feature). That’s why many local guides call it the cheapest general shopping site. (ginee.com)
• SHEIN (international fast‑fashion site) often has very low per‑item prices for trend clothing in the ₱200–₱500 range and regular flash sales—good for ultra‑cheap fashion if you accept longer delivery and variable quality. (truehost.ph)
• Zalora specializes in fashion and offers better brand selection, returns and service, but is usually not the cheapest. (moneymax.ph)

Practical advice:

• Compare prices during big sale events (9.9, 11.11, 12.12) and use vouchers — that usually beats list prices. (moneymax.ph)
• Check shipping and return costs; a low item price can be offset by high shipping or restocking fees. (moneymax.ph)

If you want, I can compare specific item prices (e.g., basic tee, dress, jeans) across Shopee, SHEIN and Zalora right now and show the cheapest options.