Buscenter.it

Although prices may be cheap, travel by bus on that route is going to take awhile. Travel by high speed train would be the best and most efficient use of your valuable holiday time, and if you buy tickets well in advance that will be the cheapest option. For example, the heavily discounted Super Economy tickets are often priced at about €9 PP.

Yes I'd prefer trains but can't find anything cheap :/

There are cheap options on the trains, as I mentioned above. It would help to have more information on your circumstances, such as when you're travelling and what kind of prices you're looking for?

22nd dec from Florence to Milan
Trying to stay under $10
Buses I found are around $5-$10
So if trains are around that price I'd pick them

What currency are you quoting in your last post? That's a VERY low price, even for a Bus.

Unfortunately, at this late date the cheapest price I can find is an InterCity departure at 08:21 for €19 (Super Economy, travel time 3H:54M).

Hi

This is the site that's showing me that cheaper bus
https://www.busradar.com/search/?ShowTrain=False&From=Florence&To=Milan&When=2015-12-22&Company=All+companies&Passengers=1&SearchMode=0&Radius=15000

But I can't tell if it's legit or not

This is the bus
http://www.buscenter.it/

The prices you quoted for the Bus appear to be in Euro. I had a look at the websites you linked but I'm not familiar with either of them so can't offer any comments on whether they're "legit". The bus.it prices seem to be considerably lower than the others, so that seems a bit odd. That particular bus seems to terminate in San Donato Milanese, which I believe is about 10 km from the city center so you'll still have to get from there into Milan.

The travel time seems to be about the same between the Bus and the train I quoted earlier, so I suppose either one would be good. My preference would be the high speed train as I like to minimize travel times, and 1H:40M is about the quickest time direct to Milano Centrale.

Good luck with your decision.