As many have mentioned most tech instruction has moved to a daily rate plus the cost of consumables (gas and absorbent) and diving related expenses (boat fees, entrance fees, rentals, etc.) The day rate may vary from instructor but I would say $275-350 is what I see as "normal" for high level tech instruction.
Now look at MOD1 as this could actually be considered 3 different courses in the TDI universe. I know there are other MOD1 versions but I am speaking to what I know and teach. Which course you can start at with your MOD1 really depends on what you background is.
- Air Dil No Deco 100' limit and no deco. The course is on average 5 days.
- Air Dil Deco 130' limit with deco and only air dil. The course is on average 5-6 days. (I personally don't teach this course as I believe you should be adding Helium in a CCR after 100' due to a host of benefits.
- Helitrox CCR - 150' limit with helitrox as dil. This course is on average 6 days.
I have had a lot of students lately that come meeting the minimum requirements for Helitrox and leave with an Air Dil No Deco cert as their skills are not what they think they are when they start the course. This is not an insult to them just the truth. You can get yourself in a lot of trouble on a rebreather at 150' with a decompression obligation and you need to be able to deal with it underwater. I am also very upfront with my students at this level the the Helitrox CCR course is a pretty big jump for a newer CCR diver.
If you start off with just Air Dil No Deco you can upgrade to the other levels and the upgrade will take typically 2-3 days once you have some more diving at the Air Dil level under you belt and have logged the required hours and dives on the unit of your choice.
Here is my caveat in a way:
Understand that quality instruction will have a cost associated with it. This means that it will require an investment in both your energy and money. While price is a relevant consideration, it should not be your primary focus as poor instruction will cost you far more in the long-run.
As you consider options for where you will pursue training, I would encourage you to search for an instructor that has invested in getting themselves to, and beyond, the level of diving you are striving for. Look at their training, their experience, their hours of personal skill development and their ability to connect with you to help you learn and develop as a technical diver. Find out who trained them, if they are doing fun dives at the level they are teaching and more. The answers to these questions will help you select the right instructor for your needs.
Saving $200-500 on a CCR MOD1 course to get the best deal is not how I would want to get started in CCR technical diving. There are some absolutely amazing instructors out there and there are some that I don't know how they are even certified CCR divers much less instructors. Ask questions and pick your instructor wisely.
-Ben