Yes, provided that you haven’t gone with a brand that’s too obscure to have readily available replacements, buying replacement blades should definitely be an option, and an easy one at that. If you are purchasing locally, this is worth a quick search on Google on your phone.
Simply use the keywords ‘replacement blades’ and the make and model of the unit you’re considering and if you don’t get a big list of places to easily get them, we recommend that you consider a more accessible brand. Nothing will make you dislike a handy tool more than having to replace an entire unit for lack of replacement parts, so be sure to check this!