Shit, that doesn't sound very promising. What about bootlegging them. Wasn't there a period where they were bootlegged?
Yes. Apparently after 1980 or so, after authorities realized that Quaaludes were being terribly abused but before the DEA rescheduled them into the schedule 1 category, Colombian drug enterprises smuggled bootleg Quaaludes pills into the United States. However, after the DEA convinced large chemical companies in Germany and elsewhere to cease the manufacturing of methaqualone, this bootlegging pretty much stopped.
However, I do hear from time to time that methaqualone is available under various market names in some countries. For example, I have heard that methaqualone is used in South Africa and sold there in pill form mixed with another compound; I do not know what the market name is for this pill. I have also heard that methaqualone is available in Canada.
If you want some methaqualone, your best bet is to contact a chemical supplier; China is probably your best option for this. I have heard of Chinese chemical companies supplying compounds like testosterone, diazepam, and lorazepam. The drawback, of course, is that you run a legal risk during importation, and you have no idea what you're getting. Regulation is close to non-existent in China, especially among black market chem suppliers.
Maybe your best option is to attempt to synthesize the compound yourself. Of course, you need to know what the hell you're doing lest you blow yourself up or kill yourself otherwise. Where is Walter White when you need him?