Amazon just put several Project Life Core Kits on sale at weird prices. Weird but fabulous! I'd recommend picking up Seafoam or Jade at these super low prices- less than $20!
One of the other ways I keep organized in PL is to use technology. I use ohlife.com to record specific journaling for each day. Every night at 8pm (which is when I scheduled the site to email me) I get an email from ohlife that says "How was your day?" I reply to that email and it saves my journaling to a website. I also make a note if I took a photo that day. It is VERY helpful when I get behind in PL because I can look at the website and remember the specific dates of special events and have journaling to copy from that day.
Here are some other apps that might be helpful for you:
At the beginning of the year I made this video about my Project Life Planning Notebook. I had the best intentions of making more videos...and I promise I will!
Here is how I keep track of my Project Life weeks and plan my page layouts. During the week I really don't have a ton of time to sit and do a layout. I take little snippets of time to pick out pretty washi one day or go through some stamps another day...basically steal away a few minutes just to get a little artsy.
Now that we're over halfway through the year, this notebook is an awesome reminder of what a great year we have had. I love having a "rough draft" of my PL to look back on. It also helps immensely when I get caught up in actual life and need to catch up on my PL spreads.