There are services in Paraguay, such as ParaguayBox, AsuncionBox Express, Google them, and some others that are cheaper alternative to DHL. They will give you their US, usually Miami address, you buy and ship stuff there, they will ship it to Asuncion and you pick it up in their office. One company is in the center, I think on Estrella, they charge $27 annually, and about $18 per small shipment with FOB less than $100. I used these type of services in Ecuador and find them very reliable and economic.