Two options you can consider, with the first being to get a tax id, not difficult to get, however if you do purchase with one you will be trading with a paper trail, and I would suggest that you ensure that your book keeping skills are good for tax time.
Liquidated stock is always an option, juts be aware of the pitfalls when buying these types of products through liquidation, old slow moving stock, damaged stock, etc.
Singapore is spot on, most genuine wholesalers will require a tax id, and without one you will may be limited to deal with brokers, and pay a premium price for doing so.