Guys, guys, there's a reason for most things.
1) Adjust your buying strategy up, that is offer more cash initially for your corp supplies, 100% of market price rising 10% a month every month not delivered. That should make sure you get 99% of supplies promptly.
2) Build up a stock of stuff you find you use a lot of and is hard to get, in your country supplies. You can sell it to your corps directly in emergency.
3) Dont worry about the FMUs, corps can go for ages with a shortage of them before it makes any difference. AND I would recommend you buy as low quality FMU as you can to save some money, their quality doesnt seem to effect the overall product quality.
*correct at time of going to press. Certain terms and conditions may change without notice.