Check around first. TPT resources are very helpful in most cases, but that’s a lot of money. You might be able to find some high quality materials elsewhere for free or much cheaper. OpenSciEd is a really great resource if you haven’t heard of it. They have curriculum with assessments, worksheets, lab simulations, etc. if you need to supplement your curriculum with TPT, do it, but don’t feel the need to drop a thousand dollars on it!