MDAI is a research chemical that was first developed in th 1990's
. The man who led the development was David E Nichols who is probably the worlds most knoweledgeable person when it comes to psychoactive chemicals such as LSD (acid) and MDMA (ecstasy).
As a professor at Purdue University he led a team to investigate and synthesise chemical analogues of MDMA which are non-neurotoxic. Some of these are MDAI, MDAT, MDA, 6-APB and 5-IAI. At the moment MDAI and 6-APB are very popular in the research chemical market, MDAI is often refferred to as 'Sparkle' and 6-APB as 'Benzo Fury'.
These chemicals are now widely available from dozens of online retailers but unfortunately you cannot trust them all. Many of these shops are trying to get rid of old stock of banned substances such as Mephedrone and Naphyrone (NRG-1). In this case you should expect that any site selling MDAI quite cheap (10-14 per gram) probably aren't even selling MDAI at all. They are just in a hurry to shift all products.
Real vendors will have access to proper labs which can make any chemical you want in the best manner possible. This will mean less impurities and also you will get what you pay for. Try to avoid sites with middle men.
To buy MDAI is very expensive even in bulk amounts as it takes labs a long time to synthesise it and the process is very expensive due to the high quality of the finished product. This naturally means that to buy small amounts of MDAI it will be a little more expensive than other chemicals. A price range of 16-22 per gram is probably about right but I would reccommend spending at least 18 as this is a good price point for a proffessional vendor.
Another thing to look out for is the colour of MDAI. When MDAI first hit the market many sites were selling a brown chemical. This may hve been MDAI but not at its purest quality. There were also other brown substances being sold that may not have been MDAI at all but people can only really speculate. MDAI at around 98-99+% purity should be a pure bright white fine powder. It helps if the online vendor has actual photos of their own product on the site and not duplicate photos from somewhere else, this way at least they have enough confidence in their own product to have it on display. Also order from retailers that offer proof of posting or recorded delivery from Royal Mail.
Once you have found a reliable vendor to buy MDAI from I would reccommend that you buy legal drugs from them again as you can sign up to the site making it easier and also may qualify you for discounts in the future.