I would never advice anybody to get hearing aids delivered to them by placing order through internet.
Hearing aids are specialized products which need customization for an individual, which only a trained professional can do for you.
The proper fitting of earmolds plays a very important role getting advantage from a hearing aid. Poor fitting of molds can render a highly advanced hearing aid useless, by causing feedback or affecting the quality of the output. Taking good ear impressions require a lot of experience, therefore a layman may not be able to take good ear impressions, for the earmolds, thereby causing poor fit of hearing aids.
The Digital hearing aids need to be programmed for an individual based on his/her hearing loss,therefore while buying a hearing aid, the user must be present, so that it can be programmed and fine tuned according to his hearing loss, and his hearing preferences.
As hearing aids are costly products, you should always have the option of trying hearing aids before arriving at any decision to buy them.
One should always try to get the hearing aids from an Audiologist/hearing professional, who is based near their place, as you may require his/her support in future to take care of your hearing aids and your hearing problem.
Last but not the least… Buying hearing aids through postal order benefits only the seller.
Have a nice time ahead.