Is there a place where I can find a new hard drive for my Predator PH315-54-714U?

Your Predator Helios 300 PH315-54-714U laptop has the GeForce® RTX™ 3060 and has the following 2x M.2 SSD storage slot specs and 1x SATA III 2.5" HDD or SSD specs.

Storage Subsystem Specs for your PH315-54-714U that has the GN20-E3 gpu which is the NVidia RTX3060.

As you can see from the specs above the Storage 1: M.2 SSD1 slot is your laptops boot drive and the Storage 2: M.2 SSD2 slot is the M.2 slave/storage drive that are both the same read/write speeds, so you can use both for gaming as they operate at the high PCIe4x4 same speeds. While the 2.5" SATA III drive is also an additional slave/storage drive but its allot slower and is purely for storage if you want to utilize this additional space with a 2.5" SSD drive, as imo its the best storage to use for your laptop as its allot lighter than a mechanical SATA III 2.5" drive,

The best and fastest M.2 SSD PCIe4x4 drive is either the Samsung 990 Pro Gen 4 NVMe M.2 SSD drive which comes in 1TB, 2TB and up to 4TB capacities and has a Sequential Read 7,450 MB/s and Sequential Write 6,900 MB/s or the WD BLACK SN850X NVMe™ SSD drives that also come in capacities of 1TB, 2TB and 4TB and have a Sequential Read 7300MB/s and Sequential Write 6300MB/s. These drives are not cheap but they are the fastest PCIe4x4 M.2 SSD drives around, while the 2.5” I suggest that you polulate your laptop with the Samsung 870 EVO SATA III 2.5 inch SSD that also comes in capacities from 250, 500 GB and 1TB, 2TB and 4TB. The places to buy these drives are on either eBay or Amazon or any hard drive retailers on the web, as these places have periodical specials that you can take advantage of. Good luck and hope this helps you out.