The minimum amount of probes to get a 100k Miranimum Storage setup is about 9 Storage Probes, 2 Booster Probes and 3 Duplicator Probes. You should already have enough Booster and Duplicator Probes from completing the main story and all of Kristy's & Tobias's missions. The only thing you would need more is Storage Probes depending on how many you have already.