Hey there,
So I'm going to proceed under the assumption that you are just starting out building your portfolio. If that is the case, I wouldn't worry too much about ensuring your portfolio is fully diversified right from the get-go. For example, you can buy 3 or 4 today, and pick up the other 6-10 in the years to come. Being well-diversified helps limit the volatility of one's portfolio. However, IMO the longer the runway you have for investing, the more your portfolio can absorb that volatility.
For example, when I was just starting out - I had but a few stocks and simply added new stocks as I progressed. Over time, once I felt my portfolio was sufficiently diversified, then I'd look at adding/topping up existing positions to remain in balance.
That said, it is also a personal preference. With that in mind, if one can sleep better being diversified right off the hop, then there is nothing that is stopping one from dividing the initial capital among the full complement of foundational. The important aspect is to keep fees in mind. If one is paying $10 per transaction - I'd avoid this and just focus on a few stocks. If however, one has a commission-free broker like Wealthsimple, then it's not an issue.
Finally, don't worry about share price - it really should not be the basis of an investment. If one wanted to select only a few Foundational stocks to start with, then it is best to focus on those that provide the best value today - not the lowest stock price. The lowest stock price doesn't necessarily mean it is the cheapest so it's important to understand the difference. If it helps, today I view BEP, CNQ, RY and T as being some of the better-valued Canadian Foundationals. In the US the best valued are PFE, BLK, and HD. If you are familiar with technicals, you can also use charts to time entry points, but ensure you are well familiar with the ones you are using. Personally, I stick to RSI as it is the simplest form and has, for the most part, been a good indicator of entry points when I am buying long-term positions.
Mat