I'm hoping to travel to Mexico for a vacation this Summer using a "Last Minute" idea on, Redtag.ca, for example.
I'm trying to get an idea on budget and was hoping to find out if people have noticed vacation packages cheaper in the Summer than in the Winter.
Please let me know!

if you want to go, book it now, if you go on a trip in early January it's the cheapest time of year, summer will be the most expensive.
it's based on demand- higher demand for a vacation in the summer= higher prices. the first week of January is the cheapest time in the year for flights, so I'd assume that it's the same for most methods of vacationing. i wouldn't wait for a 'Last minute" deal- often times you have to pay extra fees just because your booking last minute.