Here's the deal: the bigger the rocket, the cheaper it is to send 1kg of stuff into space. That's just physics, can't argue with it.
For a big boy like the Falcon 9, you're looking at less than $3,000 to get 1kg into LEO.
Now, switch to a super small rocket, like China's Kuaizhou-1A, and that cost jumps to just under $10,000 per kg. And that's with China being super competitive on price globally; even they can't make small rockets cheap.
Then you've got one of the world's tiniest launch rockets, Japan's SS-520, where the cost per kg skyrockets to a whopping one million bucks!
So, the Kheibar Shekan rocket weighs about twice as much as the SS-520, but it's only about 1/15th the weight of the Kuaizhou-1A.
Even if Iran's labor costs are dirt cheap, you're probably still looking at a cost several times to maybe even ten times higher than the Kuaizhou-1A.
Now, let's imagine you take a two-stage rocket that could launch 1kg into LEO, but instead, you use it as an MRBM (Medium-Range Ballistic Missile) with a 1500km range. The payload for that scenario would be about 60kg.
So, if we assume the warhead is 500kg, and we use the Kuaizhou-1A's cost as our baseline (let's call it 1x), here's how the relative costs and actual expenses would roughly shake out:
1x (Baseline with Kuaizhou-1A): Around $80,000
5x (A realistic guess): Around $400,000
10x (The highest it could possibly be): Around $800,000