If your packaged item can pass through the 2cm slot on a PO guage then you can post it as a large letter which will be much cheaper depending on the weight.  Of course unless you pay for registered mail you will have no trscking and no seller rotection but for low value items it is worth the risk IMO.

Mail from China is incredibly cheap as the Chinese government have an untracked postage cost of zer to encourage exports, their other postage options are also heavily subsidised.