Here's the thing, you can make a DiY co2 system out of a 2 liter soda bottle, some yeast, sugar, baking soda, and water. You can just use a wooden airstone for diffusion too. Might work better for you then the excel, as it can be pretty expensive.
I would say with driftwood, substrate, diy co2, and some low light plants for your tank, would be anywhere between 60-100 bucks if you shop at a LFS. Now that depends on what plants and how many plants you are getting.
Now, you can probably spend less then that if you look for someone on the SnS here to ask for a specific amount of used substrate or something and that will bring your spending down, as well as with plants and driftwood.
I would say with driftwood, substrate, diy co2, and some low light plants for your tank, would be anywhere between 60-100 bucks if you shop at a LFS. Now that depends on what plants and how many plants you are getting.
Now, you can probably spend less then that if you look for someone on the SnS here to ask for a specific amount of used substrate or something and that will bring your spending down, as well as with plants and driftwood.