Well the Tab is different now than when you got that $29 plan...
Cheapest iPhone is the 5S 16gb. It's $634 retail. On the website it shows the Tab Plus option only, which ends up being over $80/month, so let's ignore that since you want the cheapest option. You can do "regular" Tab of $360 off. So that's $274 upfront/in store.
Now for the plan. The cheapest plan is $30/month with your choice of either 200 minutes/100 MB or 350 minutes and no data. They both have unlimited international text, free evenings/weekends at 5pm, and Call display/voicemail.
The Tab of 360 mentioned earlier is divided by 24 months and added on top of your plan, which makes the total $45/month.