Like Vanderblade said, it's a almost one-man company... it's very difficult for him to deal with all our orders and messages.
But to ave talked with him a few times this month, he's really busy and he's aware of our issues with the stocks.
I will repeat myself but....
- If you need mapper30 boards, you can also try ordering the ones from Broke Studio. they have stock, good price (the shipping rates are correct) and you can get them in 3 weeks (same like ordering from INL). Make sure to choose "vertical" mirroring when ordering those unrom512 mapper30 boards to be ready to use with NESmaker.
- And for the shells, I sugest Aliexpress ! theu have A LOT of colors for 4$ each, you will receive it in 3 to 4 weeks (search "72pin shells")