@sweeetea, There are many reasons not to choose the BArch, but lack of program choices isn’t one of them. There are some 40+ BArch programs in the US. Of course they vary in prestige and personality, the same as “regular” undergraduate programs do. If the BArch is what you want, you should be able to put together a balanced list of reach/match/safety.
If you’re not sure that you want to go for the BArch, then you have several other choices. All are acceptable and common paths to becoming an architect.
There are a handful of schools that offer a five year MArch, in effect an undergraduate MArch. Tulane is one; there are probably others.
Next you could look at schools that offer the BA or BS in architecture or architectural studies. At some of these you apply directly to the School of Architecture. At some you apply to the liberal arts college and move into architecture later in the process.
Some of school that offer the BA/BS in architecture also have their own MArch programs; some do not. Among those that offer the MArch, some guarantee (or at least favor) admission for their own undergraduates, some do not. Generally, with a 4.0 year BA/BS, the MArch takes 2.0 years. Sometimes more, sometimes less. Each program is a little different.
It’s possible to get into a good MArch program with a BA or BS in anything – art, art history, biology, math, sociology etc. You will need to fulfill the requirements of the MArch program which generally include some art studio, art history, calculus and physics. Requirements vary from program to program. You must also put together a design portfolio which may or may not include architectural work.
So the question that you have to answer in the next few years is whether you’re committed enough to architecture to go for the BArch. You should bear in mind that while most undergraduate degrees can be funded by need-based financial aid, funding for MArch programs is less reliable. It’s available but is determined differently from undergraduate need, and the amount granted can be unpredictable.