30 capacitors in parallell?
You don't say what Q you are trying to achieve, but the capacitive reactance of 3uF at 100 MHz is in the 500\$\mu \Omega \$ range - it's going to be quite difficult to connect parts in a non-superconducting circuit and get the resistance very low in comparison- maybe with thick copper bus-bars. That's probably why you can't easily find commercial parts with that specification. Also capacitors with high pulse discharge capabilities may be export-controlled.