In order to comply with international laws, we cannot mark shipments as 'gifts' or 'samples' to bypass customs fees (besides, that rarely works anyway).
We do however mark down the cost of the items to minimize the customs value. Typically the declared value is around 25% of the invoice cost. Most countries have an allowance of at least USD25 before duty is charged, so many orders will not be subject to additional fees.
Larger orders ($150+) will normally ship with one of the expedited services (UPS, DHL etc), and are likely to be subject to duty &/or VAT charges. The same applies if you upgrade to one of the faster shipping options. This is because the global carriers (UPS, DHL, FedEx etc all exchange their information electronically, and the actual shipping cost is included in the customs valuation. This is mostly not the case for packages that are delivered by the national postal services.
Whilst we cannot be responsible for any fees, we do our best to keep them low for you :-)