Arisaka- $300 with no mum, that is the good condition price.
Folding bayonets for the Carcano usually do go for more than the rifle. If it is SA marked, even more than usual. 7.35 is harder to get than 6.5. It can be purchased but is hit or miss. Graf is the best source that I'm aware of. For a representative Italianrifle, you probably would want a 6.5
Does the mauser have Chinese markings on it? That would be pretty important for me. Top of my list would be a Chinese produced rifle but one otherwise marked would be suitable.