A good vlogging setup needs a wide-angle lens so your arm isn't strained holding it out, plus solid autofocus and a flip screen. Buying a quality setup once means it lasts four or five years, which beats replacing a cheap option every eighteen months.
Early summer is the best window to buy. Camera brands drop new models around then, which pushes last year's gear onto clearance. Using the Citi Simplicity® Credit Card gives you 0% for 18 months on purchases and balance transfers from date of account opening, letting you spread out the cost without extra fees.
Keep in mind that an intro window is a fixed deadline, not free money. If you still carry a balance when those 18 months end, standard interest applies to whatever amount is left, so set up auto-pay right away to pay it off in time.